Drawing frame for textile fibers



Nov. 14, 1939.

E. TOENNIESSEN DRAWING FRAME FOR TEXTILE FIBERS Filed Feb. 4; 1936 IQ HEB U VIII/l4 d Patented Nov. 14, 1939 UNITED STATES nnswmc 2,180,325 7 mam: Fon TEXTILE mans Ernst Toenniessen, Munich, Germany Application February 4, 1936, Serial No. 62,250

In Germany September 4, 1935 Claims. (01. 19-131 The invention relates to drawing frames as employed in spinning frames for textile fibers, of

the type known as high draft in which there is employed as a guide for a roving or the like in the roller stand a small band running round u des. It is necessary for perfect working in such apparatus that material of different lengths as to its component fibers should be handled efiiciently; at the same time it is equally necessary for that purpose that the apparatus as a whole should not be complicated but should be of the utmost simplicity, thus ensuring regular and eflicient running. Further, it is a desideratum that any new proposition leading to these advantages should be capable of being easily adapted to older types of apparatus.

It is the object of the present invention to provide drafting apparatus which will give the ad vantages above enumerated. According to the invention there is provided in a drawing apparatus a small endless band or belt with a tensioning weight fitting into the loop thereof, such weight being non-rotatable but freely swinging with a pivoted member which it supports.

For a band in such apparatus it has been proposed to employ as tensioning means a roller having teeth thereon, but fiy and fiber are apt to get upon such teeth and thus brake and displace the band. Rotatable pulleys having plane surfaces have also been proposed. As against this according to my invention the swinging we ght has side plates acting as guides. such plates swinging with the weight. Therefore, safe and continuous working is assured and the tension ng means adapts itse f to any change in the parts of the apparatus. automatically. They may be smaller and of lighter construction than a tensioning-roller, as a result of'its braking effect, and the space required is therefore smaller. The rear clearer roller of the apparatus may be so disposed that it presses againstthe back roller to clear tliesame whilst it also clears the band. At the same time the clearer roller may press so tightly against the middle roller that breakage of the roving is prevented on removal or unweighting of the middle roller. The clearer roller and tensioning means can so co-operate and be so assembled that on y on removal of the former can the latter be removed. Again, the band as will be hereinafter seen can be easily adjusted to the narrowest or widest space between the nip of the usual front rollers and the delivery from the band.

The invention further contemplates a special form of guide rail for the band as fully described hereinafter.

The annexed drawing illustrates in side sectional view a roller stand having the invention applied thereto, by way of example, and the said 5 invention will now be fully described reference being had to the drawing. Figure 1 is a view of the roller stand, with band, rollers, and accessories; and Figure 2 illustrates the principle.

The bottom rollers I, 3, and 4 and the guide rail 19 2 are borne in the stand l5. It will be under stood that both sides of the -stand are adequately arranged to take the roller and other bearings; and that seen in the illustration will be referred to. Rollers 3 and 4 are borne in the side block 15 I6 movable in the. stand l5 so that the distance between rollers l and 3 may be altered'at will. The top rollers 5, 1 and 8 run as usual on the bottom rollers and the idle presser roler 6 is loosely mounted over the rail 2. The small band 20 9 which may be of leather runs over the middle roller 3 and aroundthe guide and supporting rail 2, and around a tensioning weight I I. The weight II is a solid unit with the riveted or cast on side plates l0 and the whole is suspended upon 25 a bearer rod l2 secured in the roller stand l5; As shown in Figs. 1 and 2, it will be seen that the plates I II, are of an area so as to provide fixed flanges which extend beyond the peripheral surface of the weight, and thus more effectively 30 guide the belt, as distinguished from the customary flanges on rotating pulleys, and the like.

As the plates l0 and weight II are thus free to swing it will be clear that any adjustment tending to loosen or tighten the band loop is auto- 35 matically met by the tensioning means. In its passage the upper side of the band loop passes under the clearer roller I3, and this roller clears the back roller 4 and at the same time acts as a tensioning for the said upper side of the band 40 loop. Due to its position the clearer roller l3 presses, through the band 9, .against the midde roller 3, see the illustration. To support the clearer roller there are provided the fork bearings shown formed upon a bent spring plate I4 45 of which a bent over extremity engages upon the bearer rod 12. Within the fork bearings may be arranged bearing material 2!! in the position shown in Figure 1, this material being synthetic resin, oiled wood, or the like.

The guide and supporting rail 2 in the example shown is of symmetrical'triangular. cross section, and an advantage of thisformis that on wear taking place such rail may be turned to present a new bearing surface for the band 9, thus avoiding 55 another.

the necessity of immediately changing it for Again, with the triangular section shown the presser roller 6 has a high pressing effect to cause the band 9 to lie substantially on the whole face of one side of the rail. The distance between band 9 and the front roller nip is thus lessened. The top rollers 5, I, and 8 are weighted in known manner from a weight hook l8 transmittedthrough the saddle I!) to the three rollers. Positive weighting may however be ap plied to the rollers and I only, the back roller 8 being self-weighted. I

In the narrowest position of the rollers as seen in Figure 1, the curve in the upper side of the band loop 9, caused by the roller Us at its maximum. Now if the drawing frame is adjusted by movement of the slide blocks IS in the direction of the arrow II, the band curve is reduced to the minimum. The high position of the tension weight ll thus remains approximately the same in any adjusted position of the rollers, a distinct advantage over known arrangements, especially as the band 9 may be of an overall length to allow the tensioning medium H to tighten the band, and no more. This shortness of the band prevents the weight I I and its side plates"! from hanging out of the assembly, unless of course the clearer roller [3 and its bearer spring l4 have been removed. As before stated, the operative cannot disengage the tensioning weight unless she has first removed the roller l3. A further great improvement as compared with known designs is that the band 9 can never be engaged by the front roller nip. Both in the narrowest and the widest position of the drafting apparatus the clearer roller equalises or balances the free length of the band.

The inventive idea underlying the present improvements'is that the distance between the front roller nip and the preceding nip must be as short as possible. The relative positions of the presser roller. 6 and the guide rail 2, and the shape of the latter, permit that the said roller sinks into the band 9. There is thus produced the minimum distance desired.

In the apparatus, it is sometimes advisable to flatten the lower surface of the tension weight Ii, running the band on this flat and then guiding it round to the curved or convex part, as this has for effect a gradual transition and advantageous tangential relationship between band and weight, especially with wide bands.

I claim: I

1. In roller apparatus having front, middle and back roller pairs for the drafting of textile fibrous material, an endless band passing through the middle roller pair nip, a non-rotatable tensioning weight within the loop of the endless band, such weight being pivotally borne and having tensioning movement only in the direction of the band length, lateral band-controlling flanges upon such weight with either of which flanges the adjacent end of the band may make frictional running contact, and a guide and supporting rail serving with the weight to support the endless band in ad- 6 justed position.

2. In roller apparatus having front, middle and back roller pairs for the drafting of textile fibrous material, an endless band passing through the middle roller pair nip, a non-rotatable tensioning weight within the loop of the endless band, such weight being pivotally borne and having tensioning movement only in the direction of the band length, lateral band-controlling flanges upon such weight with either of which flanges the adjacent edge of the band may make frictional running contact, a guide and supporting rail serving with the weight to support the endless band in adjusted position, and a spring-controlled clearer roller serving to press part of the endless band against the lower middle roller, the peripheral speeds of the lower middle roller and the clearer roller being thus substantially equal, such clearer roller also making clearing contact with the lower back roller.

3. In roller apparatus having front, middle, and back roller pairs for the drafting of textile fibrous material, an endless band passing through the middle roller pair nip, tensioning means within the loop ofsuch band, a guide and supporting rail for the latter, pivoted spring members, roller shaft bearings fitted therein, a clearer roller mounted in such bearings and in clearing contact with the lower back roller whilst the clearer roller, part of the endless band, and the lower middle roller are pressed tightly together by the pressure of the spring members.

4. In the combination of parts in roller apparatus having front, middle and back roller pairs for the drafting of textile fibrous material,and a clearer roller, as claimed in the preceding claim, hooked ends upon the spring members, a round bearer rod upon which the ends are removably hooked, and forked brackets upon the other ends of the spring members and receiving the bearings for the clearer roller.

5. In roller apparatus having front, middle, and back roller pairs for the drafting of textile fibrous material, an endless band passing through the middle roller pair nip, a non-rotatable tensioning weight within the loop of the endless band, such weight being pivotally borne and being movable only in the direction of the length of the band, lateral band-controlling members upon the weight, a guide and supporting rail for the endless band, pivoted spring members, roller shaft bearings fitted thereon, a clearer roller mounted in such bearings and in clearing contact with the lower back roller, the spring pressure serving to press the clearer roller, part of the endless band,

and 'the lower middle roller, together.

ERNST TOENNIESSEN. 

